second exam summer 2010

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Kuwait University

Electrical Engineering Department

ENG 205 Fundamentals of Electrical Engineering

Summer 2009-2010 Second Exam

July 15, 2010

Instructions:

1) Verify your name and ID number below.2) Have ready on the table a photo ID card.3) Use only the sheets given to you in the exam.4) No mobile phones are allowed Leave yours with the Engineer after

switching it off.5) No borrowing of calculators allowed. Bring your own.6) Exam Duration: 5:00 - 6:30 PM7) No textbooks, notes or sheets are allowed in the exam.

Name: Name

ID: ID

Section: Section

Professor: Professor

Bldg Room

ENG 205 Second Exam July 15, 2010 SN: SN


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Question 1:

A) How many essential nodes are there in the circuit ?

B) How many Node-Voltage equations are required to solve the circuit ?

C) How many constraint equations are required using the Node-Voltage method ?

D) How many meshes are there in the circuit ?

E) How many Mesh-Current equations are required to solve the circuit ?

F) How many constraint equations are required using the Mesh-Current method ?

G) Which method is best suited to solve the circuit ?

H) Write the node voltage equations required to solve the circuit.

A)

B)

C)

D)

E)

F)

G)


150 A 3 S 7 S

5 S

4 S

6 S

8 S

74 A

100 A

15 A

191 A23 A


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Question 1 (Contd.):



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Question 2:

Use the mesh current method to find V0

V0 =


+

-5

+

-

5

40 10

+

V0

-

1.5x6V020 V

Ix


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Question 3:

Use the principle of super position to find v0 in the circuit (Use the node voltage

method in your solution whenever possible).

v0 =



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Question 4:

The variable resistor (R0) in the circuit is adjusted until the power dissipated in the

resistor in 250W. Use Thevenins theorem to find the value ofR0 that satisfy this

condition.

R0 =


,


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second exam summer 2010

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